So I got a GSD puppy. I have had experience with GSD. This time, things went wrong due to a bad breeder from whom I rescued the puppy. Breeder didn't feed puppies very much and he was ~6 lbs at 10 weeks. Breeder never told me what he fed if anything. I tried to feed him some boiled chicken at first to get him to like the place. He appeared hungry and willing. I introduced some Orijen LBP, which I had left from my other wolf dog. He ate okay from hand for a while but didn't eat from the bowl even boiled chicken. Then he quit eating more than one bite for chicken. I took him to vet, and she told me that he needed Royal Canin or Hill's because Orijen is harmful and so is raw diet. Anyways, I got him de-wormed and vaccinated. I got some Royal Canin and still he refused to eat for 2 days. I tried to feed him some boiled chicken from hand, then he refused to eat boiled chicken too. After showing tough love and trying to switch him to dry dog food, now he eats but only few bites of dry dog food (I switched to Taste of Wild). He looks very weak and weighs only 21lbs at 13 weeks. He has energy and plays and I taught him some tricks. He eats his treats, but he won't eat from bowl. Will he eventually faint from playing but not eating much? Also, will it affect his development? His parents were average size and height. I gave him some yogurt thinking he might have some digestive issues? He asks for food, but eats few bites and runs away. I tried to feed him 3 times a day, but he'd eat only 2 times.